2. Prepare corresponding tools and materials for the repaired parts. When the refill needs to be replaced, a new refill needs to be prepared. When the spring needs to be replaced, a new spring needs to be prepared.
3. Disassemble the pen body, take out the internal parts, and don't lose the small parts.
4. Install new parts into the pen body according to the parts that need to be replaced, and adjust the installation position and direction.
5. Assemble the pen body. Don't miss these parts. You can refer to the product manual or other relevant materials.
6. Put the refill into the pen body, and test that the refill writes normally and the spring can pop up normally.